Bone saw



Feb. 7, 1939. D, DAVENPORT 2,146,202

BONF; SAW

Filed March 14. 1938 2 Sheets-Sheet 1 J LJ Inventor l awe is J zavenfavrz Feb. 7, 1939. 1.. D. DAVENPORT BONE SAW Filed March 14, 1938 2 Sheets-Sheet 2 Inventor 1030:; I. Ja/vnfivrf H By .4 Horneys Patented reb. 7,1 39 2 BONE SAW Louis D. Davenport, Ava, Mo., assignor of onehalf to Oscar Sanders, Ava, Mo.

Application March 14, 1938, Serial N0.- 195,911

2 Claims. (Cl. 143-46) The present invention relates to new and useful improvements in bone saws for use particularly by meat cutters and has for one of its important'objects to provide, in a manner as here- Referring now to the drawings in detail, it will be seen that the reference numeral I designates generally a mast structure comprising a turntable 2 having depending therefroma, shank 3 which is iournalled in a vertical bearing 4 fixed on one side of a conventional meat block 5. Rising from the-turntable 2 is a pair of spaced uprights 6 between which braces I extend. Adjustablymounted on the upper end portions of the tion of the frame 20 is an electric motor 21. The

motor 21 drives the shaft 25 through a belt and pulley connection 28. A switch 29 on one of the members 2| adjacent the handle 24 controls the electric motor 21.

5 inafter set forth, a device of this character which uprights 6 and extending horizontally therefrom 5 is mounted in position for convenient use at all is a pair of arms 8. Braces 9 are provided for times and which is power driven, thereby doing the arms 8. Extending between the free end away with the usual hand saw. portions of the arms 8 is a rod I0.

- Another very important object of the invention Pivotally and adjustably mounted at an in- 10 is to provide a'power driven machine of the termediate point on the uprights 6 for swinging aforementioned character wherein the rotary saw movement in a vertical plane is a substantially is mounted for movement in all directions, thus U-shaped frame which is designated generally by facilitating proper engagement of said saw with the reference numeral II. The frame II comthe bone regardless of the position of the piece prises a pair of spaced side bars I2 between the of meat on the block. forward end portions of which a cross member 15 Still another important object of the inven- [3 extends. Mounted on the side bars I2 is 3, tion is to provide a power driven machine of the transverse shaft I4 having its end portionsjourcharacter described wherein the rotary saw will nalled in the uprights 6 for mounting the frame be supported in an out-of-the-way position when I l thereon. The end portions of the shaft I4 not in use. are engageable selectively in openings. I5 which 20 Other objects of the invention are to provide are provided, therefor in the uprights 6', thus a bone saw of the character set forth which will permitting vertical adjustment of the frame ll be comparatively simple in construction, strong, on the mast structure I. durable, highly emcient and reliable in use, comcounterbalance springs I6 for the frame II pact and which may be manufactured at low have one end connected to the lower portions of 25 cost. the uprights 6 and their other ends connected All of the foregoing and still further objects to the rear end portions of the side bars I2. and advantages of the invention will become ap- Mounted vertically on the cross member I3 of parent from a study of the following specifica- .the frame I I is a bearing I'I. Joumalled on the tion, taken in connection with the accompanying bearing I1 for swinging movement in a horidrawings wherein like haracters of reference deszontal plane, when the frame II is in a horizontal ignate corresponding parts throughout the several position, is an arm [8. A brace I9 is provided views, and wherein: for the arm I8.

v Figure 1 is a view in side elevation of an em- Mounted for vertical and horizontal swinging bodiment of the invention. movement on the free end of the arm I 8 is a 35 Figure 21s a view in horizontal section, taken saw frame which is designated generally by the substantially on the line 22 of Fig. 6. reference numeral 20. The frame 20 comprises Figure 3 is a perspective view of what may be side bars 2| of suitable material between which referred to as the mast structure. braces 22 extend. On the upper ends of the side Figure 4 is a plan view of the vertically swingmembers 2| hooks 23 are provided which are 40 ing frame which is mounted on the mast strucengageable over the rod I 0 for supporting the ture. saw in raised position when not in use, as shown Figure 5 is a detail view in plan of the arm in Fig. 1 of the drawings. Extending between the which swings on the frame shown in Fig. 4. lower end portions of the members 2I is a handle 4,5 Figure .6 is a view in front elevation of the saw 24. The reference numeral 25 designates a transand motorunit. verse shaft which is journalled in the lower end Figure 7 is a view in front elevation of the portions of the members 2|. Mounted on one lower portion of a slightly modified form of saw end of the shaft 25 is a circular saw 26. If deand motor unit, the handle being shown in secsired, a suitable guard or shield may be protion. vided for the saw 26. Mounted in the upper por- 50 The frame 20 is mounted on the arm l8 by means including a shaft 33 which projects horizontally from a rod 31 between certain of the braces 22. Journalled on the rod 30 is a sleeve or tube 3| having fixed thereon a depending, threaded shank 32. The shank 32 is engageable in an eye or loop 33 on the free end of the arm I8 and is retained therein by a wing nut 34. Springs 35 extend between the arm I8 and the frame 20.

It is thought that the operation of the device will be readily apparent from a consideration of the foregoing. When it is desired to use the saw 26, the hooks 23 are disengaged from the supporting rod III for permitting said saw to be swung downwardly to the meat on the block 5. One of i the side bars 2| is cut out at an intermediate point in a manner to provide an opening 38 for permitting the frame'2ll to be rotated nearly a complete revolution on the arm l3. The construction and arrangement-is such that, through the medium of the handle 24, the rotary saw 26 may be moved to any desired position for engagement with the bone to be out. Of course, the electric motor 21 may be connected with any suitable source of current supply.

- In the modification shown in Fig. 7 of the drawings, an electric motor 35 is mounted in the lower portion of the frame 20 and a shaft 36, which carries the circular saw 28, is connected directly to said motor.

It is believed that the many advantages of a bone sawing machine constructed in accordance with the present invention will be readily understood and although preferred embodiments of the device are as illustrated and described, it is to be understood that further modifications and changes in the details of construction may be resorted to which will fall within the scope of the invention as claimed.

What is claimed is:

1. A sawing machine of the class described comprising a mast including a turntable, spaced uprights rising from said turntable, arms extending horizontally from the upper portions of said uprights, a member extending between the free end portions of said arms, a frame mounted for swinging movement in a vertical plane on the uprights at an intermediate point, an arm mounted for swinging movement on said frame, a second frame mounted for substantially universal swinging movement on the free end portion of the second named arm, a power driven saw rotatably mounted on the second named frame, and means on said second named frame engageable with the member for releasably securing the saw in raised position when not in use.

2. A machine of the class described comprising a mast including a turntable, spaced uprights rising from said turntable, arms extending horizontally from the upper portions of said uprights, a rod extending between the free end portions of said arms, a substantially U-shaped frame mounted for swinging movement in a vertical plane on the uprights at an intermediate point, said frame including spaced side members and a cross member extending between one end of said side members, a rod mounted in the side members at an intermediate point and journalled in the uprights, counterbalance springs con nected to the other ends of the side members and to the uprights, a second frame structure mounted for universal swinging movement on the cross member, a saw rotatably mounted on the second frame, and hooks on the second named frame engageable with the rod for supporting the saw in raised position when not in use.

LOUIS D. DAVENPORT. 

